Exploring an Origin of the QCD Critical Endpoint

TL;DR

This paper proposes a new exactly solvable model for the QCD critical endpoint by linking the deconfinement transition to surface tension vanishing, resulting in a phase transition characterized by a simple pole in the partition function.

Contribution

It introduces a novel approach to modeling the QCD critical endpoint by matching phase transition lines with surface tension behavior, differing from previous models.

Findings

Deconfinement phase is characterized by a simple pole in the partition function.

First order phase transition arises from discontinuity in surface tension derivative.

Model provides a new perspective on the nature of the QCD critical endpoint.

Abstract

We discuss a new way to develop the exactly solvable model of the QCD critical endpoint by matching the deconfinement phase transition line for the system of quark-gluon bags with the line of their vanishing surface tension coefficient. In contrast to all previous findings in such models the deconfined phase is defined not by an essential singularity of the isobaric partition function, but by its simple pole. As a result we find out that the first order deconfinement phase transition which is defined by a discontinuity of the first derivative of system pressure is generated by a discontinuity of the derivative of surface tension coefficient.